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HTML

              
                <body>
  <div class="game">
    <div id="center">
      <div class="count-wrapper">
        <div class="count"></div>
        <p class="count-text">0</p>
      </div>
      <div class="start-wrapper">
        <button type="button" class="btn btn-default" id="start"></button>
        <p class="start-text">START</p>
      </div>
      <div class="strict-wrapper">
        <button type="button" class="btn btn-default" id="strict"></button>
        <p class="strict-text">STRICT</p>
      </div>
      <div class="restart-wrapper">
        <button type = "button" class="btn btn-default" id="restart">RESTART</button>
      </div>
    </div>
      <div id="tl" class="arc 1">
        <audio id="yellow">
        <source src="https://s3.amazonaws.com/freecodecamp/simonSound1.mp3">
      </audio>
      </div>
      <div id="tr" class="arc 2">
        <audio id="blue">
        <source src="https://s3.amazonaws.com/freecodecamp/simonSound2.mp3">
      </audio>
      </div>
      <div id="bl" class="arc 4">
        <audio id="green">
        <source src="https://s3.amazonaws.com/freecodecamp/simonSound3.mp3">
      </audio>
      </div>
      <div id="br" class="arc 3">
        <audio id="red">
        <source src="https://s3.amazonaws.com/freecodecamp/simonSound4.mp3">
      </audio>
      </div>
  </div>
</body>
              
            
!

CSS

              
                .game {
  height: 500px;
  width: 600px;
  background-color: black;
  margin: 0px auto;
  transform: translateY(5%);
  border-radius: 0px;
  !important
}

#center {
  width: 200px;
  height: 200px;
  background-color: #ccc;
  border-radius: 100px;
  border: solid #fff 1px;
  margin: 0px auto 0px auto;
  -webkit-transform: translateY(75%);
  position: relative;
}

#tl,
#tr,
#bl,
#br {
  height: 200px;
  width: 200px;
  position: absolute;
  z-index: -1;
  opacity:0.6;
  cursor:pointer;
}

#tl {
  border-radius: 200px 0 0 0;
  background-color: yellow;
  margin: -152.5px auto 0px 95px;
}

#tr {
  border-radius: 0 200px 0 0;
  background-color: blue;
  margin: -152.5px auto 0px 305px;
}

#bl {
  border-radius: 0 0 0 200px;
  background-color: green;
  margin: 52.5px auto 0px 95px;
}

#br {
  border-radius: 0 0 200px 0;
  background-color: red;
  margin: 52.5px auto 0px 305px;
}

.count-wrapper {
  background-color: indigo;
  height: 70px;
  width: 75px;
  margin: 70px auto 0px 10px;
}

.count {
  height: 50px;
  width: 75px;
  background-color: orange;
  border-radius: 25%;
  !important margin: 100px auto 0px 0px;
  margin-left: 0px;
  margin-top: 80px;
  border:1px solid white;
}

.count-text {
  margin: 2.5px auto 0px 10px;
  font-size:1.5em;
  width:15px;
  margin:-40px auto 0px auto;
  text-align:center;
}

.start-wrapper{
  background-color:blue;
  display:inline-block;
  width:40px;
  margin-left:90px;
  height:70px;
  -webkit-transform: translateY(-100%);
}

#start{
  width:20px;
  height:20px;
  border-radius:50%;
  margin-top:20px;
  margin-left:7.5px;
  background-color:green;
}

.start-text{
  margin:12.5px 0px 0px 0px;
  color:white;
}

.strict-wrapper{
  background-color:orange;
  width:40px;
  margin-left:140px;
  -webkit-transform: translateY(-275%);
}

#strict{
  margin-left:7.5px;
  background-color:red;
}

.strict-text{
  color:white;
}

#restart{
  position:absolute;
  margin:-120px 0px 0px 55px;
  cursor:pointer;
}

.lit{
  opacity:1; 
}

              
            
!

JS

              
                var user_light_timeout; //variable to keep track of the timeout method for when the user clicked light goes out. 
$(document).ready(function() {
  simon.init();
  $("#restart").on("click", function(){
    simon = new Simon();
    simon.startGame();
  });
});
//constructor that will recreate the Board at every instant 
var Simon = function() {
  this.sequence = [];
  this.copy = [];
  this.active = "true";
  this.mode = "normal";
  this.turn = "ai";
  this.player_time = true; //boolean to check if player has finished inputting
  var that = this;
  //function to initiate the game
  this.init = function() {
    $("#start").on("click", function() {
      that.startGame();
    });
    //click event handler to turn on strict mode
    $("#strict").on("click", function() {
      that.mode = "strict";
      $(this).css("background-color", "black");
      that.startGame();
    });
  };
  //method to start the game 
  this.startGame = function() {
    this.round = 0;
    $(".count-text").text(this.round);
    this.deactivateSimonBoard();
  };

  this.newRound = function() {
    if (this.player_time == true) {
      this.sequence.push(this.randomNumber(1, 4));
      if(this.sequence.length > 20){
        window.alert("You won! Congrats!");
        simon = new Simon();
        simon.startGame();
      }
      this.animate(this.sequence);
    }

  };
  //method to animate the board
  this.animate = function(sequence) {
    $(".count-text").text(this.round);
    if (this.player_time == true) {
      var i = 0;
      var that = this;
      var interval = setInterval(function() {
        that.lightUp(sequence[i]);

        i++;
        console.log("This is i: " + i);
        if (i > that.sequence.length) {
          clearInterval(interval);
          that.turn = "player";
          that.activateSimonBoard();
        }
      }, 4000);
    }

  };
  //method to light up each tile individually
  this.lightUp = function(tile) {
    if (tile != undefined) {
      console.log("this is the tile to light up: " + tile);
      $("." + tile).css("opacity", "1");
      this.playSound(tile);
      window.setTimeout(function() {
        $("." + tile).css("opacity", "0.6");
      }, 500);
    }

  };
  //method to generate a random number between 1 and 4. Does not need to be a public function. Make it private
  this.randomNumber = function(min, max) {
    return Math.floor(Math.random() * (max - min + 1) + min);
  };
  
  //method to play the audio file of each color
  this.playSound = function(sound){
    console.log(sound);
    switch(sound){
      case 1:
        $("#yellow")[0].play();
        break;
        
      case 2:
        $("#blue")[0].play();
        break;
        
      case 3:
        $("#red")[0].play();
        break;
        
      case 4:
        $("#green")[0].play();
        break;
    }
  }
  
  //function to enable the user to interact with the board
  this.activateSimonBoard = function() {
    this.player_time = false;
    var check_arr = []; //array to check for right inputs from user
    if (this.turn == "player") {
      var simon_this = this; //to assign the this of simon to a variable
      $(".arc").off().on('click', function() {
        console.log('check'); //to check if this function is entered without click

        var _this = this;
        $(this).css("opacity", "1");

        //switch case statement to change id to readable number
        switch ($(this).attr('id')) {
          case "tl":
            check_arr.push(1);
            simon_this.playSound(1);
            break;
          case "tr":
            check_arr.push(2);
            simon_this.playSound(2);
            break;
          case "br":
            check_arr.push(3);
            simon_this.playSound(3);
            break;
          case "bl":
            check_arr.push(4);
            simon_this.playSound(4);
            break;
          default:
            console.log('error');
        }

        user_light_timeout = window.setTimeout(function() {
          $(_this).css("opacity", "0.6");
        }, 1000);

        if (isEquals(check_arr, simon_this.sequence, _this)) {
          console.log("right input");
          simon_this.player_time = true;
          simon_this.turn = "ai";
          simon_this.deactivateSimonBoard();
        } 
      });

    }
  };

  //function to check equality of two arrays
  function isEquals(arr_1, arr_2, tile) {
    var ctr = 0;
    for (var i = 0; i < arr_1.length; i++) {
      ctr++;
      if (arr_1[i] != arr_2[i]) {
        if(simon.mode == "strict"){
          simon.player_time = true;
          simon.turn = "ai";
          $(tile).css("opacity", "0.6");
          clearTimeout(user_light_timeout);
          window.alert("Wrong input. You need to start over");
          simon.startGame();
        }
        else{
          simon.player_time = true;
        //introduced this line here to immediately recreate pattern if wrong element clicked on. 
          window.alert("Wrong input");
          simon.animate(simon.sequence);
        }
      } else if (arr_1[i] == arr_2[i]) {
        console.log("This input is correct");
        if (arr_1.length == arr_2.length && ctr == arr_1.length) {
          return true;
        }
      }
    }
  }

  //method of simon object to deactivate the simon board while player enters input
  this.deactivateSimonBoard = function() {
    console.log("in deactivateSimonBoard");
    var _this = this;
    if (this.turn == "ai") {
      $(".game").off("click");
      this.round++;
      $(".count-text").text(_this.round);
      _this.newRound();
    }
  };
};

var simon = new Simon();
              
            
!
999px

Console